Printing machine



Aug. 3, 1937. K. T. LANG- PRINTING MACHINE Filed May 2o, '195e 2Sheets-Sheet l Aug. 3, '1937.

I 2 Sheets-Sheet 2 K. 'r LANG 'PRINTING MACHINE Filed May 20, 1936Pate-ated Aeg. 3, `1931' UNITED STATES;

PATENT OFFICE In Germany June 1s, 1935 4 Application May 20, 1936,Serial No.'80,774

ll claims. .-(cl. Vlon-40s) This invention relates to a gripperarrangement on the impression cylinder of printing machines.

In the known devices the grippers on the impression cylinder arearranged on a special shaft,

l 5 and. independently thereof, the holding means l ,for the packing ofthe impression cylinder have also been arranged on the latter. Thisconstruction renders access to the packing diilicult, so that anexchange of the packing requires removal of the grippers, which ispossible only by disengaging the driving members for `the grippers. Theentire process is extremely slow and bothersome.

The invention completely eliminates ,these drawbacks by arranging thegrippers for the sheet and the holding means for the packing on a commoncarrier insuch manner that both members l can be moved about a jointaxis and out of operative position.

When work vhas to be done on the packing, the

- grippers and the holding means are simultane-l ously swung out ofworking position so as to ren- ,der the packing easily accessible. Asaccording 4 to the invention only a single spindle is provided 25, aboutwhich both members move, only one bore 4 the pa s in the position duringexchange of `the packi and Fig. 4 a view similar to the one shown" inFigal, with the grippers in raised position. f.

40 Referringl tothe drawings, in the end walls 2 of ,the impressioncylinder I a spindle 3 extend- .ing .over the'v entire length of thecylinder is mounted, which carries both the gripper-s and. the holdingmeans for the cylinder packing I2.

On the outside of the cylinder wall 2 'aisinglearmed lever 4 carrying atits free end a roll I is firmlyl keyed onto the spindle 3. The roll 3cooperateswith a cam path, not shown, which is stationarlly arranged onthe machine frame, also not shown., Near the end walls 2 of theimpression cylinder-I two carriers 6 ride freely movably on the;r`spindle 3 and support with their free ends thejclamping plate 1f for thepacking I2. The

holding plate 1 is provided on vthe side facing the packing with teethand possesses bores through which the screws II pass which can bescrewedinto the impression cylinder I. By means of the screws II the plate I isfirmly pressed upon the packing and the appurtenant portion of, theimpression cylinder I to hold the packing I2 in position.

Over the length of the impression cylinder I bearings 8 are distributedand arranged on the -holding plate l, in which grippers I0 for the sheetlo are movably disposed on carrying pins 9. With their front end theygrippers engagethe upper part of the holding plate 1, whereas at theirrear `iecting beyond the spindle 3 the pins I8 carry j a. link pin 20 onwhich a connecting rod I4 is rotatably arranged. On this connecting rodIl the levers I3 are looselydisposed -by means oi' correspondingly largebores. Check nuts I5 prevent the levers I3 from slipping off from therod I4. A compression spring I1 tends to press the driving leverI3,always in the direction of the check nuts I5. 'f ,Y

When the packing I2 is to be removed or exchanged, the clamping plate 1,after loosening of the holding screws II, is swung back about the 30spindle 3. Simultaneously, the entire gripper arrangement moves also.Since the spindle 3 stands still and the driving lever I3 is cushionedon the rod Il by the spring I1.,the lever I3 can slide back withoutiniluencing the control means for l35 the grippers III. During thisoperation the partsv are in the position shownnn Fig. 3 which indi-'cates that work on the packing is not interfered with by the grippers.

. The grlppers I0 are moved into the position 40 'according to Fig. 4 bymeans of a cam path arranged outside the impression cylinder and notshown. The cam path, by means of the lever 4, turns the spindle 3clockwise to a certain extent. whereby the control pin I8 for thegrippers -IIJ 45 is moved into the position according to Fig. 4. Thismotion is transmitted by the connecting rod I4 and the members I5 to thedriving lever I3, so that the grippers III are compelled to swingupwardly about the nshaft 9, i. e'., into their re- 50 ceivingy orreleasing position. When the cam path provided outside the impressioncylinder slopes again, the control members are moved back again intotheir initial position and the' grippers, by 55 .means of thecompression spring I1, are pressed f upon their support or upon theinserted sheet.

I claimzt 1. Impression cylinder for rotary printing machines,comprising a cylinder, a packing for the cylinder, holding means for thepacking, means for fastening the holding means to the cylinder, bearingson said holding means, an axle in said bearings, sheet grippers on saidaxle, control means for the grippers and a spindle disposed in thecylinder and actingv as pivot about which said holding means for thepacking are adapted to move without iniluencing said control means.

2. Impression cylinder for rotary printing machines, comprising acylinder, a packing for the cylinder, holding means for the packing,means for fastening the holding means to the cylinder, bearings onsaid'f-holding means, an axle in said bearings, sheet grippers on saidaxle, control means for the grippers, a spindle disposed in the cylinderand acting as pivot about which said holding means for the packing areadapted to move and additional means operated by the said carrying axleand means for controlling the sheet grippers, said means comprising acontrol lever arranged on the spindle, a driving lever on the carryingaxle, a connecting rod ilexibly uniting said two levers and means forturning said spindle corresponding to the working rhythm of the machine.

4. Impression cylinder for rotary printing machines, comprisingarecessed cylinder, la packing for the cylinder, holding means forv thepacking, a spindle arranged in the recess of the cylinder, carriers forthe holding means freely movably disposed on the spindle, means forfastening the holding means and the packing to the cylinder, bearings onthe holding means, a carrying axle in said bearings, sheet grippersfirmly arranged on said carrying axle and means for controlling thesheet grippers, said means comprising a lever passing through thespindle, a connecting rod articulated to the free end of said lever, adriving lever firmly arranged on the carrying axle of the grippers andloosely embracing said connecting rod With its free end,A holdersdisposed at the end of said connecting rod for preventing said drivinglever from slipping off from said connecting rod, a compression springon said connecting rod tending to press said driving lever constantly inthe direction of said holders, cam paths outside the cylinder and acontrol lever arranged on the outside of the cylinder on the spindle andcooperating with said carn paths to turn the spindle for opening orclosing the grippers.

KARL THEODOR LANG.

